Scotland Yard has launched an investigation after a letter containing white powder purporting to be anthrax was addressed to Meghan Markle at Kensington Palace.

The letter - addressed to both Meghan and Prince Harry - sparked a full security scare with specialists being rushed in to check the material.

Security measures already in place meant the package was intercepted before it reached the couple.

Analysis of the powder also found that it was harmless.

Meghan, 36 and Harry, 33, are understood to have been informed of the incident.

Analysis of the powder also found that it was harmless.

Officers from the Met’s Counter Terrorism command were called in after the letter was sent to Kensington Palace on February 12, a day before police revealed a package containing white powder had been sent to the Palace of Westminster.

The second letter is reported to have been sent to the office of Home Secretary Amber Rudd at the Houses of Parliament and the material inside was also found to be non-harmful.

Detectives are believed to be examining if the two incidents are linked.

Counter terrorism detectives have launched an investigation to trace the senders of the letters but there have been no arrests so far.

The incident is being played down officially by police but it has put Scotland Yard on high alert ahead of the Royal wedding of the couple in May.

Security for the day is under constant review with potential threats ranging from a worst scenario of a terror attack to threats from deranged individuals.

Meghan and Harry are due to ride around a public route to greet crowds in a carriage after they wed at St George’s Chapel on Saturday May 19.